Integrated cooling system for electronic devices

• US 7,215,547 B2
• Filed: 08/16/2004
• Issued: 05/08/2007
• Est. Priority Date: 08/16/2004
• Status: Active Grant

• Current Assignee: Delphi Technologies Ip Limited (BorgWarner Incorporated)
• Original Assignee: Delphi Technologies, Inc. (BorgWarner Incorporated)
• Inventors: Chang, Shih-Chia, Berlin, Carl W., Myers, Bruce A., Peugh, Darrel E., Fairchild, M. Ray
• Primary Examiner(s): Datskovsky; Michael
• Assistant Examiner(s): HOFFBERG, ROBERT JOSEPH
• Application Number:
  US10/919,168
• Publication Number:
  US 20060034052A1
• Time in Patent Office: 995 Days
• Field of Search: 361699-703, 361/719, 257713-715, 165/80.4, 165/104.33, 165/80.5, 165/121, 165/165, 174/15.1, 174/252, 174/16.1
• US Class Current: 361/701
• CPC Class Codes: H05K 1/0206 by printed thermal vias
• CPC Class Codes: H05K 1/0272 Adaptations for fluid transport, e.g. channels, holes
• CPC Class Codes: H05K 2201/064 Fluid cooling, e.g. by integral pipes
• CPC Class Codes: H05K 3/4611 by laminating two or more circuit boards H05K3/4652 takes precedence
• CPC Class Codes: H05K 7/20254 Cold plates transferring heat from heat source to coolant

Abstract

The present invention provides a method for producing an electronic assembly and an electronic assembly with an integrated cooling system for dissipating heat. The electronic assembly comprises a base; and at least one electrical component attached to the base. The base defines an integrated cooling system having a fluid channel spanning within the base and at least one heat exchanger in heat communication with the fluid channel. The integrated cooling system may further include a pump attached to the base for directing the flow of the fluid within the fluid channel, and a port in fluid communication with the fluid channel for receiving fluid from an external source.

Claims

1. A method for producing an electronic assembly with an integrated cooling system comprising the steps of:

(a) fabricating a base defining an integrated cooling system comprising a fluid channel for receiving a cooling fluid; and

(b) attaching at least one electrical component on the base;

(c) fabricating a plurality of micro-channels within the at least one electrical component; and

(d) attaching a cap to the base over the at least one electrical component to provide a cap space in fluid communication with the fluid channel for receiving and retaining the cooling fluid, the plurality of micro-channels being in fluid communication with the cap space;

whereby heat generated from the at least one electrical component is transferable to the cooling fluid to be dissipated.

2. The method of claim 1, wherein step (a) comprises more than one of the steps of:

(e) fabricating interconnected channels in the base to form the fluid channel for receiving and communicating the cooling fluid;

(f) fabricating a first heat exchanger relative to the at least one electrical component for transferring heat from the at least one electrical component to the cooling fluid;

(g) fabricating a second heat exchanger relative to an outer surface of the base for transferring heat from the cooling fluid to an external environment;

(h) attaching a pump on the base for directing a flow of fluid within the fluid channel;

(i) fabricating at least one port on the base for receiving the cooling fluid into the fluid channel, the at least one port being in fluid communication with the fluid channel; and

(j) fabricating a thermally conductive layer between the at least one electrical component and the base for conducting heat from the at least one electrical component toward the base.

3. The method of claim 2, wherein at least one of steps (f) and (g) comprises the step of fabricating a plurality of thermal vias on a surface of the base.

4. The method of claim 3, wherein the step of fabricating the plurality of thermal vias includes filling the thermal vias with a thermally conductive material.

5. The method of claim 2 further comprising the step of enclosing the base and the electrical component with a housing body.

6. The method of claim 5 wherein step (e) further comprises the step of fabricating a plurality of interconnected channels in the housing body in fluid communication with the fluid channel in the base.

7. The method of claim 6, wherein the housing body defines convection fins projecting outwardly from an outer surface of the housing body for transferring heat outside the housing body.

8. The method of claim 7, wherein the plurality of the interconnected channels in the housing body is in communication with at least one of:

an external pump, and an external heat exchanger.

9. The method of claim 2 wherein step (i) includes coating the at least one port with a material impervious to fluid.

10. An electronic assembly produced by the method of claim 1.

11. An electronic assembly comprising:

a base; and

a fluid channel spanning within the base for receiving and transporting a cooling fluid therein;

at least one electrical component attached to the base, the base defining an integrated cooling system in thermal communication with the at least one electrical component for dissipating heat from the at least one electrical component;

a cap sealed on the base and enclosing the at least one electrical component on the base, the cap defining a cap space surrounding the at least one electrical component and in fluid communication with the fluid channel for receiving and retaining cooling fluid;

wherein the electrical component includes a plurality of micro-channels in fluid communication with the cap space.

12. The electronic assembly of claim 11, wherein the integrated cooling system comprises:

at least one heat exchanger sealed within the base and in thermal contact with the fluid channel for dissipating heat.

13. The electronic assembly of claim 12, wherein the at least one heat exchanger comprises:

a first heat exchanger integrated within the base and in thermal contact with the at least one of electrical component, the first heat exchanger transferring heat from the at least one of electrical component to the cooling fluid; and

a second heat exchanger integrated within the base and in heat communication with the fluid channel for transferring heat from the fluid to be disposed externally.

14. The electronic assembly of claim 13, wherein the first heat exchanger defines a plurality of thermal vias disposed within the base and in heat communication with the fluid channel.

15. The electronic assembly of claim 14, wherein the plurality of thermal vias is filled with a thermally conductive material.

16. The electronic assembly of claim 14, wherein the plurality of thermal vias is filled with at least one of:

silver, gold, tungsten, molybdenum, and copper.

17. The electronic assembly of claim 13, wherein the second heat exchanger defines a plurality of thermal vias disposed within the base and in heat communication with the fluid channel.

18. The electronic assembly of claim 17, wherein the plurality of thermal vias is coated with a thermally conductive material layer.

19. The electronic assembly of claim 17, wherein the plurality of thermal vias is coated with at least one of:

silver, gold, tungsten, molybdenum, and copper.

20. The electronic assembly of claim 12 further comprises:

a pump attached on the base and operably connected to the fluid channel for driving a flow of the fluid.

21. The electronic assembly of claim 12 wherein the integrated cooling system further comprises:

a thermally conductive layer disposed between the at least one electrical component and the base for transferring heat from the at least one electrical component to the base, the thermally conductive layer enclosed within the cap space.

22. The electronic assembly of claim 21, wherein the integrated cooling system further includes a plurality of micro-channels defined within the thermally conductive layer, and in fluid communication with the fluid channel.

23. The electronic assembly of claim 12 further comprising a housing for enclosing the base and the at least one electrical component.

24. The electronic assembly of claim 23, wherein the housing includes a housing body having convection fins projecting outwardly from an outer surface of the housing body for dissipating heat externally of the housing.

25. The electronic assembly of claim 24 wherein the at least one heat exchanger includes a plurality of thermal vias in heat communication between the fluid channel and the housing body.

26. The electronic assembly of claim 24, wherein the fluid channel extends within the housing body.

27. The electronic assembly of claim 26, wherein the fluid channel extends though the housing body and is adapted to be in thermal contact with an external heat exchanger.

28. The electronic assembly of claim 12, wherein the cooling system further comprises at least one port for introducing the fluid from a fluid source to the integrated cooling system, the at least one port is in fluid communication with the fluid channel.

29. The integrated electronic assembly of claim 11, wherein the base is adapted to form at least one of:

a laminated printed circuit board (PCB), a high-temperature co-fired ceramic (HTCC) module, and a low temperature co-fired ceramic (LTCC) module.

30. The electronic assembly of claim 11, wherein the base defines at least one substrate layer disposed below the at least one electrical component.

31. The electronic assembly of claim 11, wherein the integrated cooling system is adapted to connect to at least one external cooling component.